Arc-lamp.



A. BLONDEL.

ARC LAMP.

Patented Mar. 20,1917.

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A. BLONDEL.

ARC LAMP.

APPLICATION FILED MAR. 20. 19H.

1 220 063. Patented Mar. 20,1917.

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A. BLONDEL.

ARC LAMP.

APPLICATION FILED MAR. 20. 1914.

1,220,063. Patented Mar. 20, 1917.

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HU'NITED STATES PATENT oFFIoEi ANDRE BLONDEL, OF PARIS, FRANCE, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION OF NEW YORK.

ARC-LAMP.

Application filed March 20, 1914.

To all whom it may concern:

Be it known that I. Axum: BLONDEL, a citizen of the French Republic, residing at Paris, France, have invented certain new and useful linprovements in i\lC-Li.lnl)S, of which the Following is a specification.

My invention has reference to an arc lamp, and more particularly to a lamp of the inclosed flame type. In lamps of this character fumes are evolved from the are which carry solidifiable products of combustion. These products of combustion should not be allowed to deposit upon the inclosing globe to any appreciable extent, particularly that region of the globe through which the most useful light passes, as such deposit obscures the light and seriously impairs the eiiiciency of the lamp. One object of my invention is the provision of a simple and etlicient circulatory system for the gases comprising a depositing chamber or chambers located above and remote from tie arc, the walls of which are preferably exposed to the atmosphere so that they are kept cool, and means comprised within said-system for inducing a circulation through said depositing chamber where the solidiliable matter carried by the is largely deposited so that the gases which are returned to the inclosing globe from the chamber are suiliciently relieved ot the soliditiable products of com bustion to prevent appreciable deposit on the iuclosing globe.

.another object of my invention isthe provision ot a novel organization of parts for inducing a circulation of gases within the circulatory system comprising a chamber located immediately above the arc in which the gases evolved from the are are primarily received and from w iich they are conducted to an upper, more remote chamber through suitable passages, other passages conducting the gases from said upper chamber past and below the lower chambe where they are returned to the inclosing globe.

Other novel features of my invention will appear in the description and will be particularly pointed out in the claim.

For a fuller understanding of my invention, reference may be had to the accompanying drawings, which show one embodiment of the same, and in which Figure l is a vertical section of a lamp taken on the Specification of Letters Patent.

Patented Mar. 20, 1917.

Serial No. 826,014.

line 1, 1, Fig. 3, showing the casing in elevation; Fig. 2 is a similar section taken on the line 2, 2, Fig. 3; Fig. is a transverse section taken on the line 3, 3, Fig. 1; F ig. -;lis a perspective view of the bottom plate of the lamp with the tubes secured thereto; and Fig. is a perspective view of the reflector showing the top of the inner inclosing globe seated against the same.

In the drawings, 1 is a shell, preferably cylindrical in form, located at the top of the lamp and closed at the top by a plate 2, and at the bottom by a plate 3. The shell is provided with a septum or partition +1 which divides the space within the shell into two chambers A and B which constitute depositing chambers for the solidifiable products of combustion evolved from the arc. t will be seen that the walls of the shell 1 are exposed to the atmosphere and this tends to keep the walls cool and to promote the deposit of products of combustion thereon. The shell 1 is provided with any convenient number of lateral openings which are closed by plugs 5 through which the chambers may be cleaned in any desired manner. A tube 6 passes axially through the shell 1 and is secured to the upper and lower plates 2 and and preferably made integral therewith. The lamp is suspended by an eye-bolt 7 passing through the tube 6 and provided at its lower end with a nut 8 which is received in a couliter-bored opening Tubes 10, 10, suitably spaced from one another, are secured to the lower plate 3 or the shell 1 in any convenientmanner and comnuinicate with the depositing chamber A. Two other tubes 11, 11 are similarly secured to the shell and communicate with the depositing chamber B. A bottom plate 12 for the lamp is provided with hollow bosses 13, 13 on its upper side, in which the lower ends of the tubes 10, 11, and 10, 11, respectively, are received and to which they are secured in any suitable manner, the tubes communicating with the hollows formed within said bosses. The bottom plate 12 is provided with an annular flange 12 depending from near its outer edge, as shown in Figs. 1, 2'and 4. An annular plate 14; is provided with a vertical flange 15 which is received about the annular flange 12 of placed between the flange 15 and the part the bottom plate, suitable packing being 12 of the bottom plate which projects horizontally beyond the flange 12. The plate ll is also provided with an upwardly and outwardly inclined flange 16, against which the outer globe 19 is seated and against which it is held by an annular ring 20. The inner inclosing globe 21 is seated in the usual cup or plate 22 which is in turn supported on a spring 23. The spring is carried on the usual cross-arm 24E, the ends of which are secured to the lower ends of rods the upper ends of the latter being secured in the plate 14.

An econonrizer 27, through which the upper electrode 28 passes in the usual manner, is secured to the bottom plate 12. A re l' iector 29 surrounds the economizer 27 and is provided with an opening 30 considerably larger than the economizer and through which the fumes ascending from the arc may pass. The reflector 29 is provided with an annular flange 31, which extends upwardly, then horizontally outwardly and then downwardly and is received within the flange 12 of the bottom plate, the reflector being spaced from the bottom plate and forming therewith a chamber C within which the fumes evolved from the arc are primarily re ceived. The reflector is provided on either side with tubular extensions 27 and 27 which pass upwardly and communicate with the tubes carrying the descending gases, which in the embodiment of my invention here shown are the tubes 10, 11. These extensions communicate with the inner globe around the lower edge of the reflector and adjacent to the inner wall of the inclosing globe.

The lower electrode 32 is carried by the electrode supporting arm 33 in the usual manner, which arm passes through a sleeve 34 secured to and suitably insulated from the bottom plate 12 of the lamp. in arm may be secured to the lower end of the sleeve 34 and electrically connected to the electrode 32, if desired, in order to avoid the resistance of the lower electrode.

It will be understood that the electrodes may be fed and regulated in any desired manner, and l have not deemed is necessary, therefore, to show such mechanism. Ususally, however, I prefer a focusing mechanism, that it to say, mechanism which feeds the electrodes in such a way as to maintain the are substantially stationary with reference to the lamp itself.

In operation, the fumes evolved from the arc ascend through the opening 30 formed in the reflector about the economizer 27 and are received within the chamber 0. The gases ascend into the recesses formed by the hollow bosses 13, 13 and through the two tubes 11 and 10, which communicate with these two recesses, to the respective depositing chambers A and B in the shell 1, through which the gases must pass before they descend through the tubes 10, 11 and the extensions 27 and 27 and thus pass downwardly around the reflector adjacent the inclosing globe to which they are returned. During this circulation, the solidifiable products of combustion are largely deposited in the condensing chambers A and B so that when they are returned to the inclosing globe they are suliicien" y purified to prevent an appreciable deposit on said globe.

With my novel form of arc inclosure, it will be seen that the gases in their circulation are compelled to pass throughout the depositing chambers A and B, and such forcet passage promotes the deposit of the solidifiable matter within these chambers.

\Vhile l have illustrated and des *ribed the preferred form of my invention, it will be understood that numerous modificatii'ms could be made without departing from the spirit thereof. A

For example, while it have shown four tubes, two tubes for the ascending and two for the descending gases, this number may be varied, though I prefer to have at least two tubes for the descending gases, as such an arrangement subjects the arc to the same influences and conditions on either side so far as the draft is concerned and thus tends to keep the same steady. It will be understood, therefore, that I do not desire to limit my intention to the details shown, except in so far as it is limited by the scope of the claim.

What I claim as new and desire to secure by Letters Patent of the United States, is:

in an arc lamp, an arc inclosure comprising an inclosing globe, a bottom plate for the lamp provided with bosses on its upper side forming recesses, a shell located. above and remote from the globe forming a depositing chamber for the fumes evolved from the arc, tubes communicating with said chamber and with the recesses formed by said bosses, and a reflector loosely surrounding the upper electrode and forming with said bottom plate a chamber in which the gases evolved from the are are received, said reflector being provided with hollow extensions projecting up-. wardly to and communicating with a portion of said tubes.

In witness whereof, I have hereunto set my hand this siXth day of March, 191

manna nloornnn Witnesses MARIA Conner, CHAS. P. PRnssLY.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

